# uncompyle6 version 3.2.3
# Python bytecode 3.6 (3379)
# Decompiled from: Python 3.6.8 |Anaconda custom (64-bit)| (default, Feb 21 2019, 18:30:04) [MSC v.1916 64 bit (AMD64)]
# Embedded file name: site-packages\sqlalchemy\engine\strategies.py
"""Strategies for creating new instances of Engine types.

These are semi-private implementation classes which provide the
underlying behavior for the "strategy" keyword argument available on
:func:`~sqlalchemy.engine.create_engine`.  Current available options are
``plain``, ``threadlocal``, and ``mock``.

New strategies can be added via new ``EngineStrategy`` classes.
"""
from operator import attrgetter
from sqlalchemy.engine import base, threadlocal, url
from sqlalchemy import util, event
from sqlalchemy import pool as poollib
from sqlalchemy.sql import schema

strategies = {}


class EngineStrategy(object):
    """An adaptor that processes input arguments and produces an Engine.
    
    Provides a ``create`` method that receives input arguments and
    produces an instance of base.Engine or a subclass.
    
    """

    def __init__(self):
        strategies[self.name] = self

    def create(self, *args, **kwargs):
        """Given arguments, returns a new Engine instance."""
        raise NotImplementedError()


class DefaultEngineStrategy(EngineStrategy):
    """Base class for built-in strategies."""

    def create(self, name_or_url, **kwargs):
        u = url.make_url(name_or_url)
        plugins = u._instantiate_plugins(kwargs)
        u.query.pop("plugin", None)
        entrypoint = u._get_entrypoint()
        dialect_cls = entrypoint.get_dialect_cls(u)
        if kwargs.pop("_coerce_config", False):

            def pop_kwarg(key, default=None):
                value = kwargs.pop(key, default)
                if key in dialect_cls.engine_config_types:
                    value = dialect_cls.engine_config_types[key](value)
                return value

        else:
            pop_kwarg = kwargs.pop
        dialect_args = {}
        for k in util.get_cls_kwargs(dialect_cls):
            if k in kwargs:
                dialect_args[k] = pop_kwarg(k)

        dbapi = kwargs.pop("module", None)
        if dbapi is None:
            dbapi_args = {}
            for k in util.get_func_kwargs(dialect_cls.dbapi):
                if k in kwargs:
                    dbapi_args[k] = pop_kwarg(k)

            dbapi = dialect_cls.dbapi(**dbapi_args)
        dialect_args["dbapi"] = dbapi
        for plugin in plugins:
            plugin.handle_dialect_kwargs(dialect_cls, dialect_args)

        dialect = dialect_cls(**dialect_args)
        cargs, cparams = dialect.create_connect_args(u)
        cparams.update(pop_kwarg("connect_args", {}))
        cargs = list(cargs)
        pool = pop_kwarg("pool", None)
        if pool is None:

            def connect(connection_record=None):
                if dialect._has_events:
                    for fn in dialect.dispatch.do_connect:
                        connection = fn(dialect, connection_record, cargs, cparams)
                        if connection is not None:
                            return connection

                return dialect.connect(*cargs, **cparams)

            creator = pop_kwarg("creator", connect)
            poolclass = pop_kwarg("poolclass", None)
            if poolclass is None:
                poolclass = dialect_cls.get_pool_class(u)
            pool_args = {"dialect": dialect}
            translate = {
                "logging_name": "pool_logging_name",
                "echo": "echo_pool",
                "timeout": "pool_timeout",
                "recycle": "pool_recycle",
                "events": "pool_events",
                "use_threadlocal": "pool_threadlocal",
                "reset_on_return": "pool_reset_on_return",
                "pre_ping": "pool_pre_ping",
            }
            for k in util.get_cls_kwargs(poolclass):
                tk = translate.get(k, k)
                if tk in kwargs:
                    pool_args[k] = pop_kwarg(tk)

            for plugin in plugins:
                plugin.handle_pool_kwargs(poolclass, pool_args)

            pool = poolclass(creator, **pool_args)
        else:
            if isinstance(pool, poollib._DBProxy):
                pool = pool.get_pool(*cargs, **cparams)
            else:
                pool = pool
            pool._dialect = dialect
        engineclass = self.engine_cls
        engine_args = {}
        for k in util.get_cls_kwargs(engineclass):
            if k in kwargs:
                engine_args[k] = pop_kwarg(k)

        _initialize = kwargs.pop("_initialize", True)
        if kwargs:
            raise TypeError(
                "Invalid argument(s) %s sent to create_engine(), using configuration %s/%s/%s.  Please check that the keyword arguments are appropriate for this combination of components."
                % (
                    (",").join(("'%s'" % k for k in kwargs)),
                    dialect.__class__.__name__,
                    pool.__class__.__name__,
                    engineclass.__name__,
                )
            )
        engine = engineclass(pool, dialect, u, **engine_args)
        if _initialize:
            do_on_connect = dialect.on_connect()
            if do_on_connect:

                def on_connect(dbapi_connection, connection_record):
                    conn = getattr(dbapi_connection, "_sqla_unwrap", dbapi_connection)
                    if conn is None:
                        return
                    do_on_connect(conn)

                event.listen(pool, "first_connect", on_connect)
                event.listen(pool, "connect", on_connect)

            def first_connect(dbapi_connection, connection_record):
                c = base.Connection(
                    engine, connection=dbapi_connection, _has_events=False
                )
                c._execution_options = util.immutabledict()
                dialect.initialize(c)

            event.listen(pool, "first_connect", first_connect, once=True)
        dialect_cls.engine_created(engine)
        if entrypoint is not dialect_cls:
            entrypoint.engine_created(engine)
        for plugin in plugins:
            plugin.engine_created(engine)

        return engine


class PlainEngineStrategy(DefaultEngineStrategy):
    """Strategy for configuring a regular Engine."""

    name = "plain"
    engine_cls = base.Engine


PlainEngineStrategy()


class ThreadLocalEngineStrategy(DefaultEngineStrategy):
    """Strategy for configuring an Engine with threadlocal behavior."""

    name = "threadlocal"
    engine_cls = threadlocal.TLEngine


ThreadLocalEngineStrategy()


class MockEngineStrategy(EngineStrategy):
    """Strategy for configuring an Engine-like object with mocked execution.
    
    Produces a single mock Connectable object which dispatches
    statement execution to a passed-in function.
    
    """

    name = "mock"

    def create(self, name_or_url, executor, **kwargs):
        u = url.make_url(name_or_url)
        dialect_cls = u.get_dialect()
        dialect_args = {}
        for k in util.get_cls_kwargs(dialect_cls):
            if k in kwargs:
                dialect_args[k] = kwargs.pop(k)

        dialect = dialect_cls(**dialect_args)
        return MockEngineStrategy.MockConnection(dialect, executor)

    class MockConnection(base.Connectable):
        def __init__(self, dialect, execute):
            self._dialect = dialect
            self.execute = execute

        engine = property(lambda s: s)
        dialect = property(attrgetter("_dialect"))
        name = property(lambda s: s._dialect.name)
        schema_for_object = schema._schema_getter(None)

        def contextual_connect(self, **kwargs):
            return self

        def execution_options(self, **kw):
            return self

        def compiler(self, statement, parameters, **kwargs):
            return self._dialect.compiler(engine=self, **kwargs)

        def create(self, entity, **kwargs):
            kwargs["checkfirst"] = False
            from sqlalchemy.engine import ddl

            (ddl.SchemaGenerator(self.dialect, self, **kwargs)).traverse_single(entity)

        def drop(self, entity, **kwargs):
            kwargs["checkfirst"] = False
            from sqlalchemy.engine import ddl

            (ddl.SchemaDropper(self.dialect, self, **kwargs)).traverse_single(entity)

        def _run_visitor(self, visitorcallable, element, connection=None, **kwargs):
            kwargs["checkfirst"] = False
            (visitorcallable(self.dialect, self, **kwargs)).traverse_single(element)

        def execute(self, object, *multiparams, **params):
            raise NotImplementedError()


MockEngineStrategy()
